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基于并联H桥变换器的无变压器串联注入器直流电压不平衡机理及平衡控制

Imbalance Mechanism and Balancing Control of DC Voltages in a Transformerless Series Injector Based on Paralleled H-Bridge Converters for AC Impedance Measurement

语言:

中文摘要

交流电力系统的小信号稳定性可通过终端阻抗测量进行评估,基于并联H桥(PHB)变换器的无变压器串联注入器是实现宽带阻抗测量的有效方案。当系统电流幅值超过临界值时,PHB变换器会出现直流电压不平衡问题。本文分析了该不平衡机理,并提出了相应的平衡控制策略。

English Abstract

Small-signal stability of ac power systems is able to be assessed by measuring their terminal impedance, and a transformerless series injector is very attractive for wideband measurement of load impedances. A typical implementation of the transformerless series injector is paralleled H-bridge (PHB) converters, where dc voltage imbalance will occur when system current magnitude is larger than a cri...
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SunView 深度解读

该技术对于阳光电源的并网性能优化具有重要参考价值。在弱电网环境下,光伏逆变器和储能变流器(PCS)的阻抗特性对系统稳定性至关重要。通过研究基于PHB的阻抗测量技术,阳光电源可提升iSolarCloud智能运维平台在电网侧的阻抗监测能力,从而更精准地进行并网参数自适应调节。此外,该研究中涉及的直流电压平衡控制策略,可直接优化PowerTitan等储能系统在多模块并联运行时的直流侧电压一致性管理,提升系统运行的可靠性与控制精度。